Alarm-gong



(No Model.)

N. J. BUSBY.

ALARM GONG. No. 447,538. 0F Patented Mar. .3, 1891.

XIIIII NITED STAT S ATENT OFFICE.

NAHUM JUDSON BUSBY, OF MAPLEVOOD, MASSACHUSETTS.

ALARM-GONG.

SPECIFICATION forming part of Letters Patent No. 447,538, dated March 3, 1891.

Application filed October 20, 1890, Serial No. 368,627. (No model.)

To all whom it may concern.-

Be it known that I, NAHUM J UDSON BUSBY, of Maplewood, county of Middlesex, State of Massachusetts, have invented an Improvement in Alarm-Gongs, of which the following description, in connection with the accompanying drawings, is a specification, like letters and figures on the drawings representing like parts.

This invent-ion is intended as an improvement upon that described in my application, Serial No. 334,061, wherein it describes an alarm-gong provided with a train of gearing actuated by a normallywound spring, the train having a pallet-wheel, which acts on a pallet secured to the hammer-carrying rockshaft. The aforesaid devices common to alarm-gongs have combined with them, as provided for in the said application, an arm connected in an adjustable manner to a pushrod, having co-operating with it. a spring, which acts normally to keep the push-rod pressed outwardly and the arm against one side of the pallet-wheel, the arm exerting suflicient friction on the pallet-wheel to prevent the rotation of the train of gearing by the actuating-spring.

In the invention to be herein described I have dispensed with the arm bearing against the pallet-wheel, and instead I have provided the push-rod with a locking-dog, which normally stands in such position as to hold one prong or end of the pallet positively locked with the teeth of the pallet-wheel. lVhen the push-rod is pushed in by the thumb upon its end, the dog is moved to release the pallet from the pallet-wheel, permitting the normally-wound spring to rotate the motor-gearing and cause the hammer to strike thegong.

One part of my invention consists in a gong, a rock-shaft, and a hammer and a pallet movable therewith, a pallet-wheel, and means to rotate it, combined with a push-rod, an actuating spring therefor, and a dog adapted to cause one end of the pallet to be retained in engagement with and to positively lock the pallet-wheel, substantially as will be described and presently claimed.

Other features of my invention will be hereinafter described, and pointed out in the claims at the end of this specification.

Figure 1 is a view, partially in vertical section, of one of myimproved gongs applied in position; Fig. 2, a broken detail to the left of the line 00, Fig. 1; Fig. 3, details in two views of the dog to lock the pallet and part of the push-rod and the guiding-arm. Fig. 4 is a detail showing in perspective part of the push-rod and the dog and the guidingarm, and Fig. 5 is a modification to be described.

A may be supposed to be part of a door or other thing to which the alarm-gong is applied for use. The base a, preferably of cast metal, receives suitable pillar-posts a, by which to support the pillar-plate a the said base and plate forming a fra me-work for the motor and its workin g parts. The base a and pillar-plate have usual or suitable bearings, such as employed in clocks or watches, to sustain the motor-shaft a which is extended out through the pillar-plate and through a threaded hub a where it has applied to it a winding thumb-nut of, by which to wind the motor-spring a, when desired, the inner end of the said spring being connected in usual manner to the said shaft.

The spring a, the ratchet b, the pawl b the main gear 19 the pinion b gear I), pinion b engaged by it, and pallet-wheel b are and may be all as usual, they constituting the motor mechanism for the hammer b, which strikes the gong b -The arm carrying the hammer is secured to a rock-shaft 19 having fast on it a pallet U, which is vibrated by the action of the teeth of the pallet-wheel against it when the motor is not held, as will be hereinafter described. upon the hub a B represents a push-button shell, preferably of metal, it having a hollow or 'open concavity, as shown at the right in Fig. 1. This concavity is partially filled from the inner side of the shell with .a push-button c, having a shoulder 2, the said push-button having the appearance in the surrounding shell of an ordinary push-button of an electric bell, the said but-ton being screwed upon the threaded end of the push-rod 0 The push-rode is extended through a hole 0 in a door, or it may be in the frame-work of the building and through the base a, and it is thereafter, as herein shown, screwed into a part 0 thereof, threaded, as at 3, and screwed through the The gong b is screwed hub d of the dog 71., said hub having an attached guide (1, having a hole for the reception of the palletshatt If, so that the said pallet-shaft acts as a guide for the push-rod 111 its longitudinal movements. The part c of the push-rod beyond the said hub and guide, as best shown at the left in Fig. 3, is reduced in diameter to take bearing in a suitable hole in the pillar-plate, a shoulder at, left by reducing the push-rod, being acted upon by a rather strong spring (1, attached by a screw 10 to the pillar-plate, the spring by its pressure on the shoulders normally acting to keep the dog 76 at the back of the pallet Z1 (see Fig. 2) in such position as to cause one of the points of the pallet to be held positively in one of the spaces between the teeth at the periphery of the pallet-wheel, thus positively lockin g the pallet-wheel. As soon as the push-rod is moved in opposition to the spring cl, the dog is removed, so that it no longer serves to nold the pallet and lock the pallet-wheel, and thereafter the spring a starts the train and sounds the gong.

I have herein shown the push-rod as made in two pieces, but it might be made in one piece.

Vhen the gong is put togetherin its manufacture with the push-rod in two parts, the part 0' thereof will be turned to lengthen or shorten the effective length of the push-rod, so that the dog it will stand in the proper position with relation to the back of the pallet, and viewing Fig. 2 the dog there in its normal position acts as a stop or locking device for the train of gearing, for the dog by acting against the inner end of the pallet holds the prong at that end of the pallet into one of the spaces at the periphery of the pallet-wheel. Instead, however, of the dog acting directly upon the inner end of the pallet to cause the prong at that end of the pallet to engage and positively lock the pallet-wheel, 'the said dog may be slightly changed in its position about the push-rod so as to act as a backstop and receive against it the ham mer-arm close to the palletcarrying rock-shaft, and with the dog in such position the prong at the forward end of the pallet (see Fig. 5) is held in one of the spaces at the periphery of the palletwheel and the pallet-wheel positively locked. It

will be noticed that either end of the pallet may thus be made to lock the pallet-wheel.

Should the spring (Z become weak in use or wear by contact with the shoulder 4,then the push button may be turned on the outer threaded end of the puslrrod, and as the button has a shoulder 2 in contact with the shell B it results that the push-rod may be moved longitudinally to compensate for loss in strength of the spring or the wear between it and the shoulder. If desired, however, the apparatus maybe dismembered and the part c of the push-rod be rotated in the hub.

It is not intended to limit this invention to the exact shape shown for the push-rod, or for the hammer-carrying arm, or for the spring cl, the improvement or combination constituting my invention being particularly pointed out and distinctly claimed in the claims hereof.

By the term gong I mean any usual sonorous body like a gong or hell.

To sound the gong, one has only to push upon the push-button as when ringing an ordinary electric hell.

I claim 1. A gong,a rock-shaft, and a hammer and a pallet movable therewith, and a pallet-wheel and means to rotate it, combined with a pushrod, an actuating-spring therefor, and a dog arranged upon the push-rod and adapted to cause one end of the pallet to be retained in engagement with and to positively lock the pallet-wheel, substantially as described.

2. A gong containing the following instru mentalities, viz: a rock-shaft having a hammer and a pallet, a pallet-wheel, an actuating train of gearing therefor containing a normally-wound spring, and a spring-actuated pushrod having a dog or projection adapted to normally ellect the lockingof one end of the pallet into one of the spaces of the pallet-wheel, to thus positively lock the said wheel, substantially as described.

3. A gong containing the following instrumentalities, viz: a rock-shaft having a hammer and a pallet,a pallet-wheel,an actuating train of gearing therefor containing a normally-wound spring, and a spring-actuated pushrod composed of separable parts, whereby the said rod maybe adjusted as to its lengtlnthe said rod having a dog or projection adapted to normally effect the locking of one end of the pallet into one of the spaces of the palletwheel, to thus positively lock the said wheel, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

NAHUM JUDSON HUSBY.

Witnesses:

.TAs. II. CHURCHILL, EMMA J. BENNETT. 

